Convertidor Adc

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ADC0801 ADC0802 ADC0803 ADC0804 ADC0805 8-Bit mP Compatible A D Converters

December 1994

ADC0801 ADC0802 ADC0803 ADC0804 ADC0805 8-Bit mP Compatible A D Converters
General Description
The ADC0801 ADC0802 ADC0803 ADC0804 and ADC0805 are CMOS 8-bit successive approximation A D converters that use a differential potentiometric ladder similar to the 256R products These converters are designedto allow operation with the NSC800 and INS8080A derivative control bus with TRI-STATE output latches directly driving the data bus These A Ds appear like memory locations or I O ports to the microprocessor and no interfacing logic is needed Differential analog voltage inputs allow increasing the common-mode rejection and offsetting the analog zero input voltage value In addition the voltagereference input can be adjusted to allow encoding any smaller analog voltage span to the full 8 bits of resolution
Y Y

Y Y Y

Y Y Y Y

Differential analog voltage inputs Logic inputs and outputs meet both MOS and TTL voltage level specifications Works with 2 5V (LM336) voltage reference On-chip clock generator 0V to 5V analog input voltage range with single 5V supply No zero adjust required 0 3standard width 20-pin DIP package 20-pin molded chip carrier or small outline package Operates ratiometrically or with 5 VDC 2 5 VDC or analog span adjusted voltage reference

Key Specifications
Y Y Y

Features
Y Y

Compatible with 8080 mP derivatives no interfacing logic needed - access time - 135 ns Easy interface to all microprocessors or operates ‘‘stand alone’’

Resolution Totalerror Conversion time

g

LSB g

8 bits LSB and g 1 LSB 100 ms

Typical Applications

TL H 5671 – 1

8080 Interface

Error Specification (Includes Full-Scale Zero Error and Non-Linearity) Part Number FullVREF 2 e 2 500 VDC VREF 2 e No Connection Scale (No Adjustments) (No Adjustments) Adjusted LSB
g

ADC0801 g ADC0802 ADC0803 g ADC0804 ADC0805
TL H 5671–31
TRI-STATE is aregistered trademark of National Semiconductor Corp Z-80 is a registered trademark of Zilog Corp C1995 National Semiconductor Corporation

LSB

LSB
g 1 LSB g 1 LSB

TL H 5671

RRD-B30M115 Printed in U S A

Absolute Maximum Ratings

(Notes 1

2) Storage Temperature Range Package Dissipation at TA e 25 C ESD Susceptibility (Note 10)
b 65 C to a 150 C

If Military Aerospace specifieddevices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Voltage (VCC) (Note 3) 6 5V Voltage b 0 3V to a 18V Logic Control Inputs b 0 3V to (VCC a 0 3V) At Other Input and Outputs Lead Temp (Soldering 10 seconds) Dual-In-Line Package (plastic) 260 C Dual-In-Line Package (ceramic) 300 C Surface Mount Package Vapor Phase (60seconds) Infrared (15 seconds) 215 C 220 C

875 mW 800V

Operating Ratings (Notes 1 2) Temperature Range TMINsTAsTMAX ADC0801 02LJ ADC0802LJ 883 b55 CsTAs a 125 C b 40 C s TA s a 85 C ADC0801 02 03 04LCJ b 40 C s TA s a 85 C ADC0801 02 03 05LCN ADC0804LCN 0 CsTAs a 70 C ADC0802 03 04LCV 0 CsTAs a 70 C ADC0802 03 04LCWM 0 CsTAs a 70 C Range of VCC 4 5 VDC to 6 3 VDC

Electrical Characteristics
Thefollowing specifications apply for VCC e 5 VDC TMINsTAsTMAX and fCLK e 640 kHz unless otherwise specified Parameter ADC0801 Total Adjusted Error (Note 8) ADC0802 Total Unadjusted Error (Note 8) ADC0803 Total Adjusted Error (Note 8) ADC0804 Total Unadjusted Error (Note 8) ADC0805 Total Unadjusted Error (Note 8) VREF 2 Input Resistance (Pin 9) Analog Input Voltage Range DC Common-Mode Error PowerSupply Sensitivity Conditions With Full-Scale Adj (See Section 2 5 2) VREF 2 e 2 500 VDC With Full-Scale Adj (See Section 2 5 2) VREF 2 e 2 500 VDC VREF 2-No Connection ADC0801 02 03 05 ADC0804 (Note 9) (Note 4) V( a ) or V(b) Over Analog Input Voltage Range VCC e 5 VDC g 10% Over Allowed VIN( a ) and VIN(b) Voltage Range (Note 4) 25 0 75 Gnd – 0 05
g

Min

Typ

Max
g g g g1 g1

Units...
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